21. Those who refuse could have herbicide sprayed on their drug crops. 22. Vivanco said the discovery has several potential applications as a herbicide . 23. These same problems occur in agriculture with pesticide and herbicide resistance. 24. Lack of herbicides and pesticides improve biodiversity fitness and population density. 25. Biotechnology has offered a solution in the form of herbicide tolerance. 26. The work provided a model used worldwide to develop biological herbicides . 27. In general, vetiver is highly tolerant to herbicides and pesticides. 28. Triazine compounds are often used as the basis for various herbicides . 29. The herbicides are effective to the plant part exposed above water. 30. British planners did not believe herbicides were logistically feasible against Germany.
